[luatex] Glue node without spec field?
luigi.scarso at gmail.com
Thu Jan 7 13:00:25 CET 2010
On Thu, Jan 7, 2010 at 9:11 AM, Taco Hoekwater <taco at elvenkind.com> wrote:
> Manuel Pégourié-Gonnard wrote:
>>>From the LuaTeX manual, I'm inclined to think that a glue node always have a
>> spec field. However, experience shows that it's not true:
>> assert(callback.register('post_linebreak_filter', function(head)
>> local n = node.slide(head.list)
>> assert(node.type(n.id) == 'glue', 'last node is not glue.')
>> assert(n.spec, 'glue node without spec field')
>> compile with luatex 0.50.0 gives an error:
>> error: <\directlua >:1: glue node (subtype 9) without spec field
>> Am I misunderstanding the manual, or is this a bug?
> That was a bug, fixed in svn trunk now. If you don't want to compile
> the trunk, you can just treat 'nil' in a spec field as equal to 0.
If I understand it correctly,
if subtype is not 0 then spec is an empty node
So in this case
subtype=9 and spec= <node nil < 0 > nil : glue_spec 0>)
This is different to say that
if subtype is not 0 then spec is nil
9 <node nil < 0 > nil : glue_spec 0> nil
n.leader == nil
Is it OK ?
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